The head of a pig is placed in front of policemen as they stand guard in front of a Christmas tree during a demonstration in Athens

The head of a pig is placed in front of policemen as they stand guard in front of a Christmas tree during a demonstration in Athens December 20, 2008. People protesting over the fatal shooting of a youth in central Athens two weeks ago, threw garbage at the Christmas tree at central Syntagma square. REUTERS/John Kolesidis (GREECE)